TrustedInstaller.exe question

This may seem trivial,and might just be my OCD kicking in, but yesterday I noticed TrustedInstaller ran in the morning and did a check for updates, and then it just stayed in Task manager most of the day, using no CPU or ram or anything really, just sitting at 900 k(but now it’s at 4000k). Thing is, it never does this. I’m completely updated (using Windows 7 desktop), so I restarted yesterday afternoon and it was gone for the rest of the day, until waking the computer from sleep this morning it ran again and now is just sitting in task manager, again doing nothing I think. It did another check for updates this morning, found none, so why is it running? I have 1 “important” update from January that’s been there, the Framework kb2901983 update that’s not really necessary and I don’t think would start causing this problem since it’s been there since January. Also have some optional updates,again, from past few months, although one is recent, May 15th, a Windows 7 update that I guess isn’t important.
So why is it running if it’s not installing anything? Will it go away eventually? Usually if that’s running, rundll32 is running too, but it’s not. So again, is this nothing to worry about? Could it be update kb3035583 that was released a few days ago? It automatically downloaded itself at 3am on the 20th, but then I saw the shield sign near shutdown so I thought I had to restart to let it take affect.
Also,mthe Framework update from January I mentioned says “download is pending…” Could that be causing TrustedInstaller to stay open? How do I make it not pending? And actually, can I just end the TrustedInstaller.exe process?